"I spent 30 years in federal prison," said Platshorn, who was released in 2008 and now advocates for the legalization of medical marijuana. "I'm going to make sure it happens for the whole state, and eventually the whole country."

Platshorn now runs workshops for senior citizens -- called Should Grandma Smoke Pot? -- and lobbies for the legalization movement.

But his newest endeavor is much bigger. He’s piggybacking on Florida’s November ballot initiative to legalize medical marijuana. On Saturday, he’ll be hosting a weed workshop – a cannabis college – for people to learn about the possible rules and regulations in the budding industry from experts in Colorado and Washington.

"You have to prepare," he said. "I met a smoke-shop owner the other day who thinks he's gonna have a dozen dispensaries. That’s very unlikely to happen. People have unrealistic expectations.

“And if you're a grower, the rules and security are going to be very, very stiff."

Doctors, dispensary owners and growers from states that have legalized medical pot will be on hand to talk with entrepreneurs about what they’re likely to face should Amendment 2 be passed in Florida.

The seminar will be held on Saturday from 9 a.m. – 8 p.m. at the Hawthorn Suites hotel in West Palm Beach.

MORE: America's 20 Highest States:

America's 20 'highest' states

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Highest States - Generic

Vermont has the highest rate of illicit drug use in the country, with 15 percent of residents saying they've used within the past month, according to 2010-2011 surveys from the Substance Abuse and Mental Health Services Administration. Using those figures, here are the 20 highest states in America: